Charge Generation and Recombination in Diketopyrrolopyrrole Polymer: Fullerene Bulk Heterojunctions Studied by Transient Absorption and Time-Resolved Microwave Conductivity
Charge Generation and Recombination in Diketopyrrolopyrrole Polymer: Fullerene Bulk Heterojunctions Studied by Transient Absorption and Time-Resolved Microwave Conductivity
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二酮吡咯并吡咯聚合物中的电荷产生和重组：通过瞬态吸收和时间分辨微波电导率研究富勒烯体异质结
DOI：
10.1021/acs.jpcc.6b08379
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发表时间：
2016
影响因子：
3.7
通讯作者：
J. Hobley
中科院分区：
文献类型：
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作者：
R. Katoh;H. Matsuzaki;A. Furube;P. Sonar;E. Williams;C. Vijila;G. Subramanian;S. Gorelik;J. Hobley
研究了由给体聚合物PDPP-TNT（聚{3,6-二噻吩-2-基-2,5-二（2-辛基十二烷基）-吡咯[3,4-c]吡咯-1,4-二酮-萘}）与富勒烯受体PC71BM（[6,6]-苯基c71 -丁酸甲酯）共混而成的有机光伏体异质结薄膜的电荷生成和重组动力学。利用飞秒瞬态吸收研究了载流子的产生过程，发现电荷的产生效率不受双相复合的支配，而是受薄膜中激子扩散的限制。利用高灵敏度纳秒瞬态吸收（ns-TA）和时间分辨微波电导率（TRMC）研究电荷复合。通过ns-TA测量，我们得到了复合速率常数为1 × 10-9 cm3 s-1，并发现电荷复合受到载流子扩散的限制（langevin型复合）。TRMC信号与ns-TA在较短时间尺度上具有可比性。然而，相比之下……
Charge generation and recombination dynamics in organic photovoltaic bulk heterojunction films comprising the donor polymer, PDPP-TNT (poly{3,6-dithiophene-2-yl-2,5-di(2-octyldodecyl)-pyrrolo[3,4-c]pyrrole-1,4-dione-alt-naphthalene}), blended with the fullerene acceptor, PC71BM ([6,6]-phenyl C71-butyric acid methyl ester), have been studied. The charge-carrier generation process was studied using femtosecond transient absorption, and it was found that the efficiency of charge generation is not dominated by geminate recombination but rather is limited by exciton diffusion in the films. Highly sensitive nanosecond transient absorption (ns-TA) and time-resolved microwave conductivity (TRMC) were used to study charge recombination. From ns-TA measurements, we obtained a recombination rate constant of 1 × 10–9 cm3 s–1 and found that charge recombination is limited by the diffusion of charge carriers (Langevin-type recombination). TRMC signals were comparable with ns-TA on shorter time scales. However, in contr...
DOI：
10.1039/c4cp00485j
发表时间：
2014-03
期刊：
Physical chemistry chemical physics : PCCP
影响因子：
--
作者：
S. Albert-Seifried;Doo‐Hyun Ko;S. Hüttner;C. Kanimozhi;S. Patil;R. Friend
通讯作者：
S. Albert-Seifried;Doo‐Hyun Ko;S. Hüttner;C. Kanimozhi;S. Patil;R. Friend